Filament of rayon from viscose



Patented Aug. 22, 1939 Walter Hamis Glover, Leamington,

Samuel Heaven, Coventry, by mesne assignments, to

and George England, assignors, American Viscose Corporation, a corporation of Delaware No Drawing. Application January 13, 1927, Se

rial No. 161,020. In Great 1 Claim.

This invention relates to an improved process for the manufacture and production of viscose artificial silk threads, filaments or the like and has for its object to produce such silk filaments s or the like which shall possess a reduced lustre.

According to this invention we incorporate intimately with. the spinning solution of viscose a small proportion of a high boiling liquid petroleum jelly. By the term "high boiling 1!) liquid petroleum or petroleum jelly is meant a non-solid petroleum which does not boil at the temperatures at which the viscose or the artificial silk produced therefrom is subjected in the ordinary processes of manufacture. The high boiling liquid petroleum, and the petroleum ,jelly, can each be readily emulsified with the viscose, for example, they may be dissolved in or added to the carbon bisulphide or,incorporated with the cellulose xanthate,. or mixed with the viscose 20 before spinning. l

Instead of' high boiling liquid petroleum or petroleum jelly alone, a mixture of these two can be added to or incorporated in the viscose, and we include both of these, singly and also as a mix- 35 ture of the two, under the expression high boiling non-solid petroleum".

The'threads, filaments and the like obtained by spinning viscose with a small proportion of a high boiling liquid petroleum or petroleum jelly 30 or a mixture of the two contain a certain quantity of this petroleum body, which is persistently retained by the thread, filament or the like and is extracted either not at all or only to a small extent when the threads or filaments are treated with boiling benzol or boiling carbon tetrachloride'or hot soap solution.

The proportion of the high boiling liquid petroleum or of petroleum jelly or the mixture of both to be incorporated with the viscose accord- 40 ing to this invention, depends upon the degree of dulling or reduction of lustre required.

For example, the addition 01 0.1 per cent by Britain March 29,

weight of petroleum jelly to a viscose produces a .certain diminution in the lustre of the finished product, although larger quantities may be employed in order to reducethe lustre to a greater extent.

The following example will serve to illustrate further how the invention may be carried out in practice but the invention is not limited to this example. The parts are by weight.

5 parts of petroleum jelly are added to 1,000 parts of viscose containing 7.5 per cent of cellulose, and are well mixed until the petroleum jelly is thoroughly emulsified throughout the viscose. The mixture is filtered and placed under a vacuum in order to remove air bubbles and is then projected through a nozzle containing fine holes into a suitable spinning bath, such for instance as that described in Example 2 of the specification of British Letters Patent No. 406 of 1911. The fibres are then washed, desulphurised and bleached in the usual manner. When finished, the fibres possess considerably less lustre than ordinary viscose artificial silk, and they contain about from 3 to 5 per cent of petroleum jelly, which is extracted either not at all or only to a limited extent, when the threadsare treated with boiling benzol or boiling 'carbon tetrachloride or with hot soap solution.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is:

Viscose artificial silk thread. containing a small proportion of a high boiling petroleum dispersed throughout the body of the thread for the purpose set forth, the quantity of petroleum being from about one'per cent and upwards by weight of the thread, depending upon the degree of dulling required.

WALTER HAMIS GIDVER.

GEORGE SAMUEL 

